The Waterrun Weather Forecast
- 22
- 33
Possible storm
- 24
- 29
Possible shower
- 20
- 28
Becoming windy. Partly cloudy
- 19
- 27
Partly cloudy
- 19
- 23
Shower or two
- 18
- 23
Partly cloudy
- 17
- 23
Partly cloudy
Today 21 Dec Sydney
Sunny morning. Slight chance of a shower in the afternoon and evening. The chance of a thunderstorm in the afternoon and early evening. Light winds becoming northwest to northeasterly 15 to 25 km/h in the middle of the day then tending south to southwesterly 15 to 20 km/h in the evening.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- Northwest to southwesterly 10 to 15 knots tending northeast to southeasterly in the morning then tending north to northeasterly in the evening. Winds reaching up to 20 knots offshore north of Port Kembla during the afternoon and evening.
- Seas
- Around 1 metre, decreasing below 0.5 metres during the morning, then increasing to around 1 metre around midday.
- 1st Swell
- Northeasterly around 1 metre inshore, increasing to 1 to 1.5 metres offshore north of Port Kembla during the morning.
- Weather
- Partly cloudy. 50% chance of showers. The chance of a thunderstorm in the afternoon and early evening.
The Waterrun Temperature Statistics View More
December Temperature
Sydney Airport (17km)
Lowest 2 December, 2025
13.4 °CAverage December
23 °CHighest 6 December, 2025
39.2 °C
Climate (2020–Present)
Sydney Airport (17km)
Average Low 2020–2025
14.8 °CAverage 2020–2025
18.6 °CAverage High 2020–2025
23.3 °C